This is commonly used in the immune system as well, but it's a way of amplifying a signal.

免疫系统也常使用这种方法,但这主要是一种放大信号的方式

耶鲁公开课 - 生物医学工程探索课程节选

Here, what's different between autocrine and paracrine is that there's some distance between the cell that produces the signal and the cell that receives the signal, but it's not too great a distance because the blood system doesn't have to be involved.

自分泌和旁分泌的区别在于,旁分泌中,产生信号的细胞和接收信号的细胞,之间存在着一定的距离,但这个距离并不远,因为血液系统并不参与

耶鲁公开课 - 生物医学工程探索课程节选